Now, I am studying in Toyama University, Japan. I will do a research about degradation of water pollutant by TiO2 photocatalytic. The point is I want to know about detail preparation of transparent TiO2 thin film. Please tell me if know about that.

There is a myriad of TiO2 preparation recipes. Follows one I have worked on

170 cc Iso propanol 12 cc Ti(isoPro)4 0.4 cc HCl 2M (10 min.)

Mix Ti precursor and Alcohol. Add drop by drop under stirring the HCl Wait 24h before making a coating. The solution can be deposited either by spinning or dipping. Cure the film at 120°C 1h and if needed at higher temperature.

Varying the HCl content can drastically changes the textural properties of the film. Try it.

Regarding the receipe provided by M Prassas (given in the first reply to this topic), i have found that it gives quite good thin coatings. However, the sol gels very fast (two days). Is there a way to prepare sol lasting for say 10 days?

There are streaks emanating from the center of the wafer for SPIN-coated TiO2 films. Does anyone know how to solve the problem? The sol is transparent and can last at least a week or even longer. Thanks very much.

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